Fuse



July 14, 1931. s. a ROGERS E1' AL m FUSE Filed March 3, ,1931- TTORNEY Patented July 14, 1931 UNITED STATES,

rATEN'r vFries GILBERT E. ROGERS, OF ROCKAWAY, AND! JOHN M. KING, F DOVER, NEW JERSEY FUSE.

y Application. `filed March 3, 1931. Serial No.v 519,772.

V(G'RAIQ'IEIl UNDER THE ACT 0F MAECI- I 3, 1883, AS AMENDED APRILBO, 1928; 370 0. G. 757) rlhe invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to us of any royalty there- This invention relates to a fuse and, more particularly, it has reference to a nose fuse for aerial drop bombs.

The principal object of the invention is to provide a fuse in which a. novel arming mechanism holds a liring mechanism in safety in both the unarmed and armed positions and insures interruption of an explosive train until the projectile equipped with the fuse is in flight.

To these and other ends, the invention consists in the construction, arrangement and4 combination of elements described hereinafter and pointed out in the claims forming a partzof.,this'specification.

A practical embodimenty of the invention is illustrated in the accompanyingdrawings, wherein:

Fig. 1 is a longitudinal sectional view of the improved fuse showing the parts in the normal unarmed position;

Fig. 2 is a sectional view on the line 2-2 of Fig. 1; and y Fig. 3 isa view similar to Fig. 1, showing the parts in the armed position. n

Referring to the drawings Vby numerals of reference; Y i y The fuse 'consists of a body 5 having 'a large cavity 6 which is closed when the head is partially inserted therein and attached by .threaded engagement -8 to the body.4 A diaphragm 9 seated on an annular shoulder 10 in the side walls of the cavity is held in place by the head'.

Passing through an axial bore 11 in the head is a striker 12 whose outer extremity carries a vane assembly 13. The shank of the striker is in threaded engagement 14 with the outer half ot the bore 11 when the fuseV is in the normal unarmed position shown in Fig. 1. A reduced spindle 12a on the striker passes through an aperture 15 in the diaphragm and has a threaded extremity 12?) normally disposed in the cavity 6 where it carries a plunger v16. The threads on the extremity 12b .have a greater pitch than the threads 14 on the. shank of the striker 12 for a purpose which -will be explained hereinafter. c

The plunger is formed with a longitudinally extending slot 17 V(Fig. 2) in which the ends of pins 18,-18 carried by the body 5 are engaged for the purpose of preventing rotational movement of the plunger. The plunger carries a plurality of tiring pins, in the present instance, two being shown. The ring pin'19 is in alignment with an instantaneous powder train 2() and the pin 21 is in alignment with a delay powder train 22. -Both of the powder trains'are carried in the body 5 and each one is in communication with one of a pair of converging flash passages 23-23.- Y. f Y Formedu in the lower or-inner end of the body is a transverse passage 24 in which is mounted a slide ory carrier 25 coniined by a plate 26 secured to the body by screws 26a. A detonator 27 in the carrier is normally out of alignment with the converged flash passages when thel carrier is held at one end of the passage by means of arod 28. The rod 28 is'positioned in ar longitudinally eX- tending'aperture 29 in the body and -is maintained inthe path of'movement of the carrier against the action of a spring by means of the plunger 16. The carrier is also provided with a spring 81 for moving it to armed position when notr opposed by the rod 28. vThe springl is seated in a cup 82 disposed in .the passage 24 and retained by a large cup 83 threaded to the body and carrying a booster charge 34.- A rod positioned in the body diametrically opposite to the rod 28 is Ycaused to bear against the block 16 by a spring 86.

,f A threaded passage 37 in the body intersects the flash passage 23 leading from the instantaneous powder train 20 and permits theselective insertion of a screw plug 38 to obstruct the passage 23.

In the normal unarmed position the parts of the fuse are'arranged as shown in Figs. 1 and 2 and the striker 12 is` positively held against rotation by means of a wire 89 passing tliroughan aperture 4.0 in the striker ""2 the striker which is threaded into th'e'fuse head until brought up against the diaphragm 9, as shown in Fig. 3. In this position the threads on the striker are disengaged from the threads in the fuse head. At the same time the extremitylQb of thef striker moves into the aperture 12 formed in the body. Since the plunger 1G is held against rotation by the pins 18-18, and since the pitch of the threads on the enti-emitT 12?) is 0reater than the pitch of the threads 14 to provide a differential screw, the plunger will be constrained to be retracted towards the da` phragm in which position itis held by the' spring-pressed rods 28 and 35, as rshown in Fig. 3. Vhen the striker is arrested by the diaphragm the threads on the extremity 12b will preferably be clear of the plunger with the outermost end thread in sufficient prox'- imity thereto to prevent the' firing 'pins vcarried by the plunger from'act'uating'the powder train inthe event of failure of the'rods 28' and or their`r springs.

The rod 28 in following the plunger re: leases the carrier 25 and the` detonatorZ? is moved in to register with the flash passages 23. On impact the striker isY driven in, shearing the diaphragm and' forcing the plunger home to set off boththe powder trains. The rod 28b`eing likewise driven in is received in the aperture 431m the' carrierV and thereby insures the retention of'the carrierin the armed position.v Y

Then it is desired t`o have thefuse'function with a delayaction the screwk plug 38'is threaded in to obstruct the' flashV passage leading from the instantaneous' powder train.

Te claim: y

1. A fuse comprising a body formed with a cavity, a frangible diaphragm inthe cavity, a. head secured in the mouth'of'the cavity and confining ther diaphragm, ay plunger in the cavity, firing pins carried by theplungV er, means for holding thev plunger'against rotation, powder trains in the body inline with the firing pins, converging iash passages leading from the powder trains, a carrier mounted transversely in the body, a. detonator in the carrier, means for moving the carrier to armed position to align the del tonator with the converging fiash passages, a rod mounted in the body, a spring normally urging the rod against the'1`3lung`er and out of the path of the carrier, and a striker having a shank threaded in the head and a reduced spindle passing through: theV diaphragm and threaded in the plunger to hold the plunger in and maintain the rod in the path of the carrier, the pitch of the threads on the spindle being greater than the pitch of the 'threads on the shankk of the striker whereby to 'retract the plunger as' thel striker is threaded inwardly.

2. A fuse comprising a body formed with a cavity, afra'ngible diaphragm `in' 'the' vcavity, a head secured in the mouth of the cavity and confining the diaphragm, a plunger in the cavity, means for holding the plunger against rotation, a carrier mounted transversely in the body, means for'moving the carrier to armed position, a rod mounted in the body, a springv normally; urging the rod against the plunger and out'of the path of the carrier, and'al'strikerhaving ashank threaded inthe headan'd a reduced spindle passing through the diaphragm and threaded in the' plunger to hold the plu-nger in and maintain the' rod in 'the path ofu the carrier, the pitch of the threadsonthe spindler being greater than the pitch ofthe threads on the sha-nk of the strikerwlrereby tov retract the plunger as thev` striker is :threaded in.- wardly.

Inafuse', a' casing,` a plunger'mounted for 'movementA longitudinally ofT the` casing, means for holding the pliingerI against roe tation, a' carrier mounted' for? movement transversely of? thecasing, arodin the cas'F ing' of" sufficient length' V'to leXtendin the' path ofl mov'ement ofboth the plunger and car.: rier, a spring urging-the rod'finto'contact withthe plunger, a'striker threaded-in the casing and having.' a' spindlex threaded in :the plunger to hold the plunger in positionvin order to maintain the-'rod in the path of' the carrier, the-'pitch of the -threads on the spindle being greater'than` the pitchI of the threads on` the striker! whereby to" retract the plunger, and frangible means: for arrestingin'ward `movement of the striker.

4. In a fuse,a casing, a'plunger vmounted for movement' longitudinally of' the casing, means for holding the plunger against rota# tion, af carrier'mounted forimovement transversely of'V thecasing, a rod 5 in the Acasingl of sufficient lengthI to extend in theA pathV of movement of both the plunger and car# rier, ai spring'l urging the rod into Contact with the plunger, andlmeans operable during flight for retracting the plunger.

5. A fuse, including a body formed with a cavity, a frangible diaphragm in the-cav'- ity, a head secured in-the'mouthfofthe cavity andfconfiningrthe diaphragm, a plunger inthe cavity,\meansffor holding. the plung; er againstl rotation, al striker threaded in the headand having ai reduced spindle passing through the diaphragm and' threaded in the plunger, the pitch of the threads on the spindle being greater than the' pit'clrof the tlireadso'n'r the striker, and means operable during flight to thread the striker into the fuse until it is arrested by the diaphragm.

6. A fuse, including a casing, a plunger' mounted in the casing for longitudinal movement, means for holding the plunger against rotation, a striker threaded in the casing and having threads of greater pitch engageable With the plunger.

7. A fuse, including a casing, a plunger mounted in the casing for longitudinal movement, means for holding the plunger against rotation, a striker threaded in the casing and having threads engageable With the plunger.

GILBERT-E. ROGERS. JOHN M. KING. 

